Bittersweet Chocolate is chocolate that contains around 70% cacao and 30% sugar. Nowadays this chocolate is more often used in baking than the traditional unsweetened chocolate. In Europe, bittersweet chocolate is simply known as dark chocolate.
Semi-sweet Chocolate contains around 60% cacao and 40% sugar. This great all-purpose chocolate can be eaten, used in baking, or even melted for decorating pastries.
Milk chocolate is chocolate that contains only 10 – 40% cacao mixed with sugar and milk solids. Occasionally vanilla is added extra flavor and lecithin for smoothness.
White chocolate contains no cacao at all and is simply made up of cocoa butter and sugar and occasionally a little vanilla for flavor. Chocolate purists don’t consider white chocolate to even be chocolate.